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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ac1cd6aa83d5f4b6d59fa94c98cb255b81e8bcfb136e50dd36c9d40ea6583d3' 
  AND token = '59fhWx9//McLv39ToHaA9yPPuXcHyi8sz2CSshUZDOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}